1. Vietnam HIV Addiction Technology Transfer Center, University of Medicine and Pharmacy, Ho Chi Minh City, Vietnam
2. Department of HIV/ AIDS Prevention, Ho Chi Minh City HIV/AIDS Prevention Association, Ho Chi Minh City, Vietnam
3. Department of HIV/ AIDS Prevetnion and Treatment, Ho Chi Minh City Centre for HIV/AIDS Prevention and Treatment, Ho Chi Minh City, Vietnam
4. Faculty of Public Health, University of Medicine and Pharmacy, Ho Chi Minh City, Vietnam
5. Psychiatry, National Drug Dependence Treatment Center and Department of Psychiatry, All India Institute of Medical Sciences (AIIMS), New Delhi, India